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How to define two fields “unique” as couple
...al")
volume_number = models.CharField('Volume Number', max_length=100)
comments = models.TextField('Comments', max_length=4000, blank=True)
class Meta:
unique_together = ('journal_id', 'volume_number',)
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Does Swift support reflection?
...[0].1.summary // "Apple"
From mchambers gist, here:
https://gist.github.com/mchambers/fb9da554898dae3e54f2
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Pull request without forking?
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GitHub has a good guide about that: help.github.com/articles/creating-a-pull-request
– Ryan Bigg
Jan 5 '15 at 3:29
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File path to resource in our war/WEB-INF folder?
.... BTW, GenericServlet now has a method to getServletContext() docs.oracle.com/javaee/6/api/javax/servlet/…
– Berin Loritsch
Sep 20 '16 at 18:25
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string.ToLower() and string.ToLowerInvariant()
... ınfo without the dot on the i instead of info and thus mucking up string comparisons. For that reason, ToLowerInvariant should be used on any non-language-specific data. When you might have user input that might be in their native language/character-set, would generally be the only time you use ...
What does ~~ (“double tilde”) do in Javascript?
...ample is:
-43.210 = 111111111111111111111111110101012
as a signed (two's complement) 32-bit binary number. (JavaScript ignores what is after the decimal point.) Inverting the bits gives:
NOT -4310 = 000000000000000000000000001010102 = 4210
Inverting again gives:
NOT 4210 = 111111111111111111111...
iOS difference between isKindOfClass and isMemberOfClass
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Streaming video from Android camera to server
...n-source project to enable Android phone to IP camera:
http://code.google.com/p/ipcamera-for-android
Raw video data is fetched from LocalSocket, and the MDAT MOOV of MP4 was checked first before streaming. The live video is packed in FLV format, and can be played via Flash video player with a bui...
iOS (iPhone, iPad, iPodTouch) view real-time console log terminal
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Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2
...swer your question directly, but it will give you the elements that are in common. This can be done with Paul Murrell's package compare:
library(compare)
a1 <- data.frame(a = 1:5, b = letters[1:5])
a2 <- data.frame(a = 1:3, b = letters[1:3])
comparison <- compare(a1,a2,allowAll=TRUE)
compa...